Roller vibrator



Feb. 22, 1966 I R BAUGH 3,236,112

ROLLER VIBRA'I'OR Filed Aug. 10, 1962 United States Patent Ofitice 3,236,112 Patented Feb. 22, 1966 3,236,112 RQLLER VIBRATOR Robert T. Baugh, Brookfield, Wis, assignor to Allis- Chalmers Manufacturing Company, Milwaukee, Wis. Fiied Aug. 10, 1962, Ser. No. 216,174 Claims. (Cl. 74-87) This invention relates to a vibrator and more particularly to a free weight vibrator adapted to impart a rapid reciprocating motion to screens or other equipment.

It is an object of the present invention to provide a vibrator which would be relatively compact and which will exert a heavy vibratory movement to any piece of apparatus to which it is attached.

Another object of the invention is to provide a vibrator in which there are no eccentric loadings on the bearings.

A further object is to provide a vibrator which may be mounted either vertically or horizontally on the apparatus which is to be vibrated.

A still further object is to provide a vibrator which will generate less heat then is now being produced.

A still further object is to provide a vibrator which will provide more rapid vibration than those now in use.

A still further object is to provide a roller vibrator which may be manufactured and sold economically.

Still further objects of the invention will become apparent upon considering the following specification which when taken in conjunction with the accompanying drawings illustrates a preferred form of the invention.

In the drawings:

FIG. 1 is a view of a vibrator used in connection with a screen adapted to grade crushed stone or the like;

FIG. 2 is a vertical transverse cross section taken along the line IIII of FIG. 1 looking in the direction of the arrows; and

FIG. 3 is a cross section taken along the line TIL-III of FIG. 2 looking in the direction of the arrows.

Referring to the drawings and particularly to FIG. 1, the vibrator generally designated is attached to the side wall of a screen 11 or other mechanism to be vibrated and is driven preferably by an electric motor 12 through a V-belt 13.

The screen 11 is mounted on vertical coil springs 14, 14 which permit limited free horizontal and vertical movement of the screen. While the vibrator is shown mounted vertically on a side wall of the screen, it will be understood from the following description that it may also be readily mounted on any horizontal portion of the screen desired as well.

Referring now to FIGS. 2 and 3, the vibrator which has been generally designated 10 consists of a cylindrical casing made of aluminum or other light Weight material and is provided with a plurality of fins 21 on the exterior thereof to more eifectively dissipate any excessive heat that might be created in the vibrator. The casing 20 has a cylindical aperture 22 therethrough to retain the vibrating mechanism.

The aperture 22 has a liner ring 24 having a concave inner surface 25, which receives a counterweight 26. The casing 20 has cover plates 23, 28 which are secured to outer faces of the body member 20 by machine screws 30. A mounting plate 32 is secured to one of the face plates by the machine screws 39 and is provided with suitable apertures 33 to permit fastening of the vibrator to the machine to be vibrated.

The face plates 28 are roughly circular in shape and have apertures providing for the mounting of bearings 35 and 36. A cover plate 37 is mounted on the outer end of the bearing aperture on the side of the machine containing the mounting plate 32 and provides a dust proof closure for the bearing aperture on that side of the machine. A second cover plate 38 is mounted on the opposite side of the machine from the cover plate 37 and forms a cover for the bearing 35 and an outlet for the drive shaft 40.

The shaft 40 has a yoke 42 mounted intermediate the two ends of the shaft to rotate therewith and provide a recess to receive the eccentric weight 26. The yoke 42 has a pair of arms 45, 45 containing pivots 46 (FIG. 3) on which are mounted links 48. The arms 45 extend on the opposite side of the shaft 40 to counterbalance the weight of the link 48. The link 48 contains a shaft 50 which is secured to each of the links 48 by a key or other suitable means.

The counterweight 26 is pivotally mounted on bearings 52 so that the weight may rotate freely about the shaft 50 as the shaft 40 is rotated. Due to the substantially V- shaped periphery of the eccentric 26 and the corresponding shape of the interior of the liner or race 24, the eccentric 26 is self-aligning in the liner race. A shelf or pillow 54 on each side of the yoke limits rotation of the link in a counterclockwise manner past the shelf. A stepped V-belt pulley is provided for the shaft 40 to provide a driving member for the vibrator.

Operation In operation the vibrator is attached through its mounting plate 32 to a piece of apparatus which is desired to vibrate and connected to a motor through a V-belt 13 operating in the sheave 56. When driving the motor the yoke 42 is rotated clockwise. Rotation of the yoke causes the eccentric counterweight to rotate about the axis 40 and as the motor increases in speed, centrifugal force causes the eccentric counterweight to move outwardly in contact with the race 25. Friction between the outer convex surface of the eccentric counterweight 26 and the corresponding concave surface 25 of the liner 24 causes the eccentric counterweight 26 to rotate about the axis 50 as the yoke 42 rotates about the axis 40.

It will be noted at this point that none of the eccentric thrust of the counterweight 26 is borne by either the bearings 52, 52 or 35, 36, the entire thrust due to eccentricity being borne by the liner 24. The swinging of the counterweight 26 about the pivot 44 is transmitted to the casing 20 and reaches the screen or other piece of machinery to be vibrated through the mounting brackets 32.

It will also be apparent that the concave surface 25 of the liner 24 forms a track for the counterweight and enables the vibrator to be mounted either horizontally or vertically on the apparatus to be vibrated without placing any excess load on either the bearings 35 and 36 or 52.

Any heat which may develop in the vibrator due to prolonged operation is transmitted through the casing 20 and the fins 21 and is thus transmitted to the atmosphere.

It will be noted particularly that the counterweight is relatively large relative to the size of the casing which is made possible by the use of the yoke42 and the link 48.

Having thus described the invention, it will be realized that the disclosure represents merely a preferred form thereof and that various changes of size, shape and arraugement of parts may be made thereto without departing from the spirit of the invention or scope of the subjoined claims.

That which is claimed is new and is desired to be secured by United States Letter-s Patent is:

1. A roller vibrator comprising: support means adapted to be attached to a mass to be vibrated; a drive shaft having axially spaced journals supported by said means, said drive shaft having a yoke configuration be-' tween said journals, said yoke configuration having a pair of spaced apart arms and a connector therebetween, said arms being transverse to the center line of said journals, one end of each of said arms extending radially outward from said center line and joining a different end of said connector, said connector being located radially outward from said center line; link means pivotally attached to said arms; and a substantially cylindrical roller weight rotatably attached at spaced points along the central axis thereof to said link means, said roller weight being adapted to rollingly engage said support means while being positioned between said yoke arms, the diameter of said roller Weight being sufliciently large that a portion of said weight extends radially inward beyond the center line of said journals in each position of said roller.

2. A roller vibrator comprising: support means adapted to be attached to a mass to be vibrated; a drive shaft having axially spaced journals supported by said means, said drive shaft having a yoke configuration between said journals, said yoke configuration having a pair of spaced apart arms and a connector therebetween, said arms being transverse to the center line of said journals, one end of each of said arms extending radially outward from said center line and joining a different end of said connector, said connector being located radially outward from said center line, the other end of each of said arms extending radially outward and on substantially the opposite side of said center line as said connector; link means pivotally attached to substantially said other ends of said arms; and .a substantially cylindrical roller weight rotatably attached at spaced points along the central axis thereof to said link means, said roller weight being adapted to rollingly engage said support means while being positioned between said yoke arms, the diameter of said roller weight being sufficiently large that a portion of said weight extends radially inward beyond the center line of said journals in each position of said roller.

3. A roller vibrator comprising: support means adapted to be attached to a mass to be vibrated, said means comprising a casing defining a chamber having an annular surface; a drive shaft having axially spaced journals supported by said casing, said drive shaft having a yoke configuration between said journals, said yoke configuration having a pair of spaced apart arms and a connector therebetween, said arms being transverse to the center line of said journals, one end of each of said arms extending radially outward from said center line and joining a different end of said connector, said connector being located radially outward from said center line, the other end of each of said arms extending radially outward and on substantially the opposite side of said center line as said connector; link means pivotally attached to substantially said other ends of said arms; and a substantially cylindrical roller weight rotatably attached at spaced points along the central axis thereof to said link means, said roller weight being adapted to engage and roll around said annular surface while being positioned between said yoke arms, the diameter of said roller weight being sufliciently large that a portion of said weight extends radially inward beyond the center line of said journals in each position of said roller.

4. A roller vibrator comprising: a support means adapted to be attached to a mass to be vibrated, said means comprising a casing having an external surface with a plurality of projecting ribs and defining a chamber having an annular surface; a race having an annular external surface rigidly engaging said annular surface of said casing, the radially inner surface of said race being an axially extending generally concave surface that is transverse to the axis of said race, all points along said concave surface being a part of a series of joined annular configurations about said axis which form said concave race surface; a drive shafthaving axially spaced journals supported by said casing, said drive shaft having a yoke configuration between said journals, said yoke configuration having a .pair of spaced apart arms and a connector ltherebetween, said arms being transverse to the center line of said journals, one end of each of said arms extending radially outward from said center line and joining a different end of said connector, said connector being located radially outward from said center line, the other end of each of said arms extending radially outward and on substantially the opposite side of said center line as said connector; link means pivotally attached to substantially said other ends of said arms; and a substantially cylindrical roller weight rotatably attached at spaced points along the central axis thereof to said link means, said roller weight having a convex outer surface, said roller weight being adapted to engage and roll around said concave surface of said race while being positioned between said yoke arms, the diameter of said roller weight being sufliciently large that a portion of said weight extends radially inward beyond the center line of said journals in each position of said roller.

5. A roller vibrator comprising: a support means adapted to be attached to a mass to be vibrated, said means comprising a casing having an external surface with a plurality of projecting ribs and defining a chamber having a circular surface; a race havinga circular external surface rigidly engaging said circular surface of said casing, the radially inner surface of said race being an axially extending generally concave surface that is transverse to the axis of said race, all points along said concave surface being a part of a series of joined circular configurations about said axis which form said concave race surface; a drive shaft having axially spaced journals supported by said casing, said journals being concentric with casing circular surface and said concave surface of said race, said yoke configuration having a pair of spaced apart arms and a connector therebetween, said arms being transverse to the center line of said journals, one end of each of said arms extending radially outward from said center line and joining a different end of said connector, said connector being located radially outward from said center line, the other end of each of said arms extending radially outward and on substantially the opposite side of said center line as said connector; link means, said link means comprising a pair of links, one end of each link being pivotally attached to substantially said other end of one arm; and a substantially cylindrical roller weight rotatably attached at spaced points along the central axis thereof to said other ends of said pair of links, said roller weight having a convex outer surface, said roller weight being adapted to engage and roll around said concave surface of said race while being positioned between said yoke arms to the extent that said roller intersects the center line of said journals for all positions of said roller.

References Cited by the Examiner UNITED STATES PATENTS 2,127,317 8/1938 Welch 74-61 2,248,182 7/1941 Mateer 7461 2,367,070 1/1945 Symons 74--61 X 2,829,527 4/1958 Fleming 74-61 2,841,995 7/1958 Sieber 7587 2,945,386 7/1960 Peterson 74-87 2,945,970 7/1960 Nordegren 7487 X 2,947,183 8/1960 Carrier 746l FOREIGN PATENTS 64,4 67 6/1955 France. 619,775 4/ 8 Great Britain.

BROUGI-ITO-N G. DURHAM, Primary Examiner.

HERBERT L. MARTIN, Examiner, 

1. A ROLLER VIBRATOR COMPRISING: SUPPORT MEANS ADAPTED TO BE ATTACHED TO A MASS TO BE VIBRATED; A DRIVE SHAFT HAVING AXIALLY SPACED JOURNALS SUPPORTED BY SAID MEANS, SAID DRIVE SHAFT HAVING A YOKE CONFIGURATION BETWEEN SAID JOURNALS, SAID YOKE CONFIGURATION HAVING A PAIR OF SPACED APART ARMS AND A CONNECTOR THEREBETWEEN, SAID ARMS BEING TRANSVERSE TO THE CENTER LINE OF SAID JOURNALS, ONE END OF EACH OF SAID ARMS EXTENDING RADIALLY OUTWARD FROM SAID CENTER LINE AND JOINING A DIFFERENT END OF SAID CONNECTOR, SAID CONNECTOR BEING LOCATED RADIALLY OUTWARD FROM SAID CENTER LINE; LINK MEANS PIVOTALLY ATTACHED TO SAID ARMS; AND A SUBSTANTIALLY CYLINDRICAL ROLLER WEIGHT ROTATABLY ATTACHED AT SPACED POINTS ALONG THE CENTRAL AXIS THEREOF TO SAID LINK MEANS, SAID ROLLER WEIGHT BEING ADAPTED TO ROLLINGLY ENGAGE SAID SUPPORT MEANS WHILE BEING POSITIONED BETWEEN SAID YOKE ARMS, THE DIAMETER OF SAID ROLLER WEIGHT BEING SUFFICIENTLY LARGE THAT A PORTION OF SAID WEIGHT EXTENDS RADIALLY INWARD BEYOND THE CENTER LINE OF SAID JOURNALS IN EACH POSITION OF SAID ROLLER. 